Intramedullary implant, system, and method for inserting an implant into a bone
An intramedullary implant system, and method for placement within a bone system are provided by the invention. The implant includes a body with at least one pair of beams arranged about a longitudinal axis of the body. The beams are each fixed to the body and each have an end. The end of one of the beams of a pair is releasably coupled to the other beam of the pair by a k-wire from one end of which extends a flexible tail. The beams are each deflectable between (i) a coupled and biased position for insertion of the beams into a respective bone, and (ii) an uncoupled position for gripping bone. The beams of each pair in the uncoupled position being arranged so as to compressively engage the bone.
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This application is a continuation-in-part application of co-pending U.S. application Ser. No. 14/179,172, filed on Feb. 12, 2014, the entirety of which is incorporated by reference herein.
FIELD OF DISCLOSUREThe disclosed device, system, and method relate to implants and, more particularly to implants for installation in an appendage for treating a variety of skeletal maladies including hammer toe.
BACKGROUND OF THE INVENTIONHammer toe is a deformity of the toe that affects the alignment of the bones adjacent to the proximal interphalangeal (PIP) joint. Hammer toe can cause pain and can lead to difficulty in walking or wearing shoes. A hammer toe can often result in an open sore or wound on the foot. In some instances, surgery may be required to correct the deformity by fusing one or both of the PIP and distal interphalangeal (DIP) joints.
The most common corrective surgery includes the placement of a pin or rod in the distal, middle, and proximal phalanxes of the foot to fuse the PIP and DIP joints. The pin or rod is cut at the tip of the toe, externally of the body. A plastic or polymeric ball is placed over the exposed end of the rod, which remains in the foot of the patient until the PIP and/or DIP joints are fused in approximately 6 to 12 weeks. This conventional treatment has several drawbacks such as preventing the patient from wearing closed toe shoes while the rod or pin is in place, and the plastic or polymeric ball may snag a bed sheet or other object due to it extending from the tip of the toe resulting in substantial pain for the patient.
Another conventional implant includes a pair of threaded members that are disposed within adjacent bones of a patient's foot. The implants are then coupled to one another through male-female connection mechanism, which is difficult to install in situ and has a tendency to separate.
Yet another conventional implant has a body including an oval head and a pair of feet, which are initially compressed. The implant is formed from nitinol and is refrigerated until it is ready to be installed. The head and feet of the implant expand due to the rising temperature of the implant to provide an outward force on the surrounding bone when installed. However, the temperature sensitive material may result in the implant deploying or expanding prior to being installed, which requires a new implant to be used.
Accordingly, an improved intramedullary implant for treating hammer toe and other maladies of the skeletal system is desirable that provides active compression across a joint and maintains compression thereafter so as to greatly increase the fusion rate. The implant should be insertable with minimal disruption to the DIP joint while optimizing compression and fixation at the PIP joint. Such an improved implant could find efficacy in Hammertoe surgery.
SUMMARY OF THE INVENTIONAn intramedullary implant system is provided that includes a body from each opposite end of which project a pair of beams arranged about a longitudinal axis of the body. The beams are each fixed to the body and each has a coupling latch with a bore so that the coupling latch of each of the beams of a pair may be releasably coupled to the other beam of the pair of beams by a removable coupling rod. A flexible tail projects from one end of the removable coupling rod projects outwardly. Each of the pair of beams is movable between (i) a coupled and biased position wherein the coupling rod is located in each bore of each latch so that the implant may be inserted into a respective bone with at least a portion of the flexible tail protruding from the implant, and (ii) an uncoupled position for internally gripping the respective bone. The beams of each pair in the uncoupled position diverge away from the longitudinal axis of the body wherein an outer surface of each beam is adapted to form a compressive engagement with the respective bone when disposed in the uncoupled position.
In another embodiment of a intramedullary implant system, a body has an end from which project a pair of beams arranged about a longitudinal axis of the body. The beams are each fixed to the body with the end of one of the beams being releasably coupled to the other beam of the pair by a removable coupling rod. A flexible tail projects from one end of the coupling rod. The beams are each deflectable between (i) a coupled and biased position for insertion of the beams into a respective bone and with at least a portion of the flexible tail positioned within a bone, and (ii) an uncoupled position for gripping the respective bone, the pair of beams in the uncoupled position being arranged so as to form a compressive engagement with the respective bone.
In a further embodiment of an intramedullary implant system a first k-wire is provided from one end of which extends a flexible tail. A body is provided from opposite ends of which project at least one pair of beams arranged about a longitudinal axis of the body. The beams are each fixed to the body and each have a coupling latch with a bore so that the coupling latch of each of the beams of a pair may be releasably coupled to the other beam of the pair of beams by the k-wire such that each of the pair of beams is movable between (i) a coupled and biased position wherein the k-wire is located in each bore of each latch so that the implant may be inserted into a respective bone and (ii) an uncoupled position wherein the k-wire is removed from each bore of each latch so that the beams of each pair diverge away from the longitudinal axis of the body wherein an outer surface of each beam is adapted to form a compressive engagement with the respective bone when disposed in the uncoupled position.
A method for implanting a device within a bone is provided that includes opening and debriding a target bone system. A canal is formed through the target bone system, and a k-wire is provided that has a flexible tail extending from one end. An implant is also provided that includes a body from opposite ends of which project at least one pair of beams arranged about a longitudinal axis of the body wherein the body defines a passageway along the longitudinal axis. The beams are each fixed to the body and each has a coupling latch with a bore. The latch of each beam is releasably coupled to one another by inserting the k-wire into the latch bores thereby biasing the beams. The implant and k-wire are inserted into the canal along with the flexible tail, often protruding from the patient's body. By pulling upon the flexible tail so as to decouple and remove the k-wire from the latches, the beams are thereby decoupled and released from their biased state so that a portion of each beam engages the surface of the surrounding bone that defines the canal.
These and other features and advantages of the invention will be more fully disclosed in, or rendered obvious by the following detailed description of preferred embodiments of the invention, which are to be considered together with the accompanying drawings wherein like numbers refer to like parts and further wherein:
This description of preferred embodiments is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description. The drawing figures are not necessarily to scale and certain features of the invention may be shown exaggerated in scale or in somewhat schematic form in the interest of clarity and conciseness. In the description, relative terms such as “horizontal,” “vertical,” “up,” “down,” “top,” and “bottom” as well as derivatives thereof (e.g., “horizontally,” “downwardly,” “upwardly,” etc.) should be construed to refer to the orientation as then described or as shown in the drawing figure under discussion. These relative terms are for convenience of description and normally are not intended to require a particular orientation. Terms including “inwardly” versus “outwardly,” “longitudinal” versus “lateral,” and the like are to be interpreted relative to one another or relative to an axis of elongation, or an axis or center of rotation, as appropriate. Terms concerning attachments and the like, such as “coupled” and “coupling” refer to a relationship wherein structures are secured or attached to one another either directly or indirectly, temporarily or permanently, through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise. The term “operatively coupled” is such an attachment or connection that allows the pertinent structures to operate as intended by virtue of that relationship.
Referring to
Distal pair of beams 6 comprise a superior beam 24 and an inferior beam 26 arranged in spaced confronting relation to one another at distal end 14 of cannulated body 4. In many of the embodiments of the invention, pairs of beams will be arranged symmetrically about longitudinal axis 17 of body 4, often so as to be bisected by the axis. Superior beam 24 is fixed to distal end 14 of cannulated body 4, and in some embodiments, is formed integral with cannulated body 4. One or more barbs 30a are located on an outer surface 31 of superior beam 24, often oriented transversely across outer surface 31. A latch-plate 34 extends inwardly, toward inferior beam 26, from a free end of superior beam 24. A bore 36a is defined through latch-plate 34. Inferior beam 26 is fixed to distal end 14 of cannulated body 4, and in some embodiments, is formed integral with cannulated body 4. One or more barbs 30b are located on a distal outer surface 32 of inferior beam 26, often oriented transversely across outer surface 32. A latch-plate 38 extends inwardly, toward superior beam 24 and latch-plate 34, from a free end of inferior beam 26. A bore 36b is defined through latch-plate 38.
Distal pair of beams 6 are cantilevered to cannulated body 4 at distal end 14, i.e., supported or clamped at one end and capable of storing elastic energy when loaded or pre-loaded at the other end or along their length. When distal pair of beams 6 are loaded during normal use, they each deflect inwardly, toward one another. Advantageously, superior beam 24 is greater in length than inferior beam 26 so that, when deflected to a optimally biased state, i.e., the beams are deflected so that a desirable amount of elastic energy is stored, with latch-plate 34 is located in overlapping adjacent relation to latch-plate 38 with bore 36a and bore 36b overlapping and communicating relation to one another (
Proximal pair of beams 8 comprise a superior beam 44 and an inferior beam 46 arranged in spaced confronting relation to one another at proximal end 15 of cannulated body 4. Superior beam 44 is fixed to proximal end 15 of cannulated body 4, and in some embodiments, is formed integral with cannulated body 4. One or more barbs 50a are located on an outer surface 51 of superior beam 44, often oriented transversely across outer surface 51. A latch-plate 54 extends inwardly, toward inferior beam 46, from a free end of superior beam 44. A bore 56b is defined through latch-plate 54. Inferior beam 46 is fixed to proximal end 15 of cannulated body 4, and in some embodiments, is formed integral with cannulated body 4. One or more barbs 50b are located on a distal outer surface 52 of inferior beam 46, often oriented transversely across outer surface 52. A latch-plate 58 extends inwardly, toward superior beam 44 and latch-plate 54, from a free end of inferior beam 46. A bore 56a is defined through latch-plate 58.
As with distal pair of beams 6, proximal pair of beams 8 are also cantilevered to cannulated body 4, but at proximal end 15, i.e., supported or clamped at one end and capable of storing elastic energy when loaded or pre-loaded at the other end or along their length. When proximal pair of beams 8 are loaded during normal use, they each deflect inwardly, toward one another. Advantageously, superior beam 44 is greater in length than inferior beam 46 so that, when deflected to a optimally biased state, latch-plate 58 is located adjacent to latch-plate 54 with bore 56a and bore 56b overlapping one another. As a result, bores 56a and 56b often will be arranged in substantially coaxial relation to the open end of through-bore 18 at proximal end 15 of cannulated body 4.
When cantilevered distal pair of beams 6 and proximal pair of beams 8 move into their respective second partially biased state, they undergo a so-called “large deflection” in accordance with classical beam theory. In other words, the moment arm of each of superior beam 24,44 and inferior beam 26,46 changes as the loaded ends of the beams deflect inwardly toward one another. Referring to
Implant 2 may be manufactured from conventional implant metal, such as stainless steel or titanium. In several preferred embodiments, however, the implants are manufactured out of shape memory materials (SMA) or alloys such as nickel titanium to enhance fixation. One example of such an alloy is Nitinol sold by Memry Corporation of Menlo Park, Calif. The implants are preferably made of nitinol, a biocompatible, shape memory metal alloy of titanium and nickel. The metal's properties at the higher temperature (austenite phase) are similar to those of titanium. The temperature at which the implants will undergo the shape transformation can be controlled by the manufacturing process and the selection of the appropriate alloy composition. Nitinol has a very low corrosion rate and has been used in a variety of medical implants, e.g., orthodontic appliances, stents, suture anchors, etc. Implant studies in animals have shown minimal elevations of nickel in the tissues in contact with the metal; the levels of titanium are comparable to the lowest levels found in tissues near titanium hip prostheses. In most embodiments of the invention, the SMA is selected to have a temperature transformation range such that the implant undergoes a transition from austenite to stress-induced martensite under the influence of deformation forces. Thus, when the distal and proximal beams of implant 2 are deflected inwardly, toward one another and then released, they are already at a temperature such that they automatically attempt to reform to their original shape.
Referring to
Implant 2 is used in systems and methods for corrective surgery at the distal B, middle A, and proximal C phalanxes of the foot or elsewhere in bones of the human or animal body, as follows. The PIP joint is first opened and debrided and an initial k-wire 75 (
Once the surgical site has been prepared in the foregoing manner, an implant 2 that has been coupled to a k-wire 60 or 61 is inserted through broached canal D (
With either arrangement, implant 2 travels down the longitudinal axis of middle phalanx A until the constrained distal beams 6 are adjacent shoulder 71 within broached canal D (
Once in the foregoing arrangement, k-wire 60 is moved distally (
In an alternative embodiment illustrated in
With proximal pair of beams 8 fully seated within the proximal phalanx C, the joint is compressed axially so as to fully seat proximal pair of beams 8 within broached canal D (
Numerous changes in the details of the embodiments disclosed herein will be apparent to, and may be made by, persons of ordinary skill in the art having reference to the foregoing description. For example, and referring to
Proximal pair of beams 88a, 88b are arranged in spaced confronting relation to one another at proximal end 95 of body 84. One or more barbs 96 are located on an outer surface of each proximal beam 88a, 88b. A groove 100b is defined as a channel through an inner distal portion of proximal beam 88a (
Implant 82 is prepared for use in corrective surgery at the distal B, middle A, and proximal C phalanxes of the foot in much the same way as implant 2. More particularly, distal pair of beams 86a, 86b are loaded so that they each deflect inwardly, toward one another such that open-ended groove 90 of body 84 and groove 100a are arranged in substantially coaxial relation to one another. Likewise, proximal pair of beams 88a, 88b are also loaded so that they each deflect inwardly, toward one another such that open-ended groove 90 of body 84 and groove 100b are arranged in substantially coaxial relation to one another. Once in this arrangement, k-wire 60a is inserted through groove 100a, open-ended groove 90, and groove 100b, thereby coupling distal pair of beams 86a, 86b and proximal pair of beams 88a, 88b in their respective optimally biased state.
As with implant 2, removal and decoupling of k-wire 60 causes distal pair of beams 86a, 86b and proximal pair of beams 88a, 88b to spring outwardly and away from one another thereby shortening their lengths so as to apply an active compressive force to the articulating surfaces of the PIP joint. Advantageously, barbs 96 are caused to bite compressively into the bone that defines the broached canal by the force of distal pair of beams 86a, 86b and proximal pair of beams 88a, 88b moving into their partially biased state as a result of the elastic energy that continues to be stored in in each beam. The biting of barbs 96 into the bone greatly enhances the compressive load exerted by implant 82. When distal pair of beams 86a, 86b and proximal pair of beams 88a, 88b spring outwardly and away from one another after the k-wire 60 is fully decoupled, the elongate channel or groove 90 having a distal end 94 and a proximal end 95 is again able to slidingly receive k-wire 60. The sharpened portion 60a of k-wire 60 is, e.g., driven proximally through the tip of the patient's toe and through distal end 94 and proximal end 95 of groove 90 of implant 82 to achieve temporary stabilization of outlying joints (e.g., the MTP joint).
Implants in accordance with the general principles of the invention may be take a variety of configurations. Referring to
Turning now to
Implant 122 is prepared for use in corrective surgery at the distal B, middle A, and proximal C phalanxes of the foot in much the same way as implant 2. More particularly, proximal cantilevered beam 126 and distal cantilevered beam 128 are loaded so that they each deflect inwardly, toward the longitudinal axis of through bore 130 of body 124 so that bore 146a of latch-plate 140 and bore 146b of latch-plate 142 are arranged in substantially coaxial relation to one another. Once in this arrangement, k-wire 60 is inserted through bore 130, bore 146a, and bore 146b, thereby coupling distal cantilevered beam 126, and proximal cantilevered beam 128 in their respective optimally biased state.
As with other implant embodiments, decoupling of k-wire 60 causes proximal cantilevered beam 126 and distal cantilevered beam 128 to spring outwardly and away from one another and away from the longitudinal axis of through bore 130 of body 124 thereby shortening their lengths so as to apply an active compressive force to the articulating surfaces of the PIP joint. Advantageously, barbs 96 are caused to bite into the bone compressively by the outward force of proximal cantilevered beam 126 and distal cantilevered beam 128 shortening as they move into their respective partially biased state. The biting of barbs 96 into the internal bone surfaces at both sides of the joint, coupled with the geometric shortening of both proximal and distal beams, greatly enhances the compressive load exerted by implant 122 across the joint. Referring to
Referring to
Implant 150 is prepared for use in surgery at a variety of orthopedic locations throughout a patient in much the same way as implant 2. More particularly, single pair of beams 160, 162 are loaded so that they each deflect inwardly, toward one another such that bore 166, bore 170, and blind bore 151b are arranged in substantially coaxial relation to one another. Once in this arrangement, k-wire 60 is inserted through bore 166, bore 170, and blind bore 151b, thereby coupling single pair of beams 160, 162 in their respective optimally biased state. As with implant 2, decoupling of k-wire 60 causes single pair of beams 160, 162 to spring outwardly and away from one another thereby shortening their lengths so as to apply an active compressive force to the articulating surfaces of the PIP joint. Advantageously, barbs 96 are caused to bite into the bone compressively by the outward force of pair of beams 160, 162 shortening as they move into their respective partially biased state. The biting of barbs 96 into the bone greatly enhances the compressive load exerted by implant 150.
Implants in accordance with the general principles of the foregoing embodiment of the invention may be take a variety of configurations. Referring to
Although the invention has been described in terms of exemplary embodiments, it is not limited thereto. Rather, the appended claims should be construed broadly, to include other variants and embodiments of the invention, which may be made by those skilled in the art without departing from the scope and range of equivalents of the invention.
Claims
1. An intramedullary implant system comprising:
- a body from each opposite end of which project a pair of beams arranged about a longitudinal axis of said body, said beams each being fixed to said body and each having a coupling latch with a bore so that the coupling latch of each of said beams of a pair is releasably coupled to the other beam of the pair of beams by a removable coupling rod, from one end of which projects a flexible cord such that each of said pair of beams is movable between (i) a coupled and biased position wherein said coupling rod is located in each bore of each latch so that said implant system may be inserted into a respective bone with at least a portion of said flexible cord protruding therefrom, and (ii) an uncoupled position for internally gripping the respective bone, the beams of each pair in the uncoupled position diverging away from said longitudinal axis of said body wherein an outer surface of each beam is adapted to form a compressive engagement with the respective bone when disposed in said uncoupled position.
2. An intramedullary implant system according to claim 1 wherein said body defines a through-bore along said longitudinal axis and said flexible cord is formed from one of the group consisting of woven, non-woven, knitted, braided or crocheted strands of metals or polymers.
3. An intramedullary implant system according to claim 1 wherein said beams each deflect inwardly toward said longitudinal axis when coupled and biased by said removable coupling rod prior to insertion into a respective bone.
4. An intramedullary implant system according to claim 3 wherein said beams are arranged symmetrically about said longitudinal axis of said body.
5. An intramedullary implant system according to claim 2 wherein said beams are arranged asymmetrically about said longitudinal axis of said body.
6. An intramedullary implant system according to claim 3 wherein said beams are arranged in diagonally spaced relation to one another on said body.
7. An intramedullary implant system comprising:
- a first k-wire from one end of which extends a flexible cord; and
- a body from opposite ends of which project at least one pair of beams arranged about a longitudinal axis of said body, said beams each being fixed to said body and each having a coupling latch with a bore so that the coupling latch of each of said beams of a pair may be releasably coupled to the other beam of the pair of beams by said k-wire such that each of said pair of beams is movable between (i) a coupled and biased position wherein said k-wire is located in each bore of each latch so that said implant system may be inserted into a respective bone and (ii) an uncoupled position wherein said k-wire is removed from each bore of each latch so that the beams of each pair diverge away from said longitudinal axis of said body wherein an outer surface of each beam is adapted to form a compressive engagement with the respective bone when disposed in said uncoupled position.
8. A method for implanting a device within a patient comprising:
- (a) opening and debriding a target bone system;
- (b) forming a canal through said target bone system;
- (c) providing a k-wire from one end of which extends a flexible cord and an implant comprising a body from opposite ends of which project at least one pair of beams arranged about a longitudinal axis of said body wherein said body defines a passageway along said longitudinal axis, said beams each being fixed to said body and each having a coupling latch with a bore;
- (d) releasably coupling said latch of each of said beams by inserting said k-wire into said latch bores thereby biasing said beams;
- (e) inserting said implant, said k-wire, and said flexible cord into said canal;
- (d) pulling upon said flexible tail so as to decouple and remove said k-wire from said latches thereby decoupling and releasing said beams from their biased state so that a portion of each beam engages a surface of the surrounding bone that defines said canal.
9. A method for implanting a device within a patient according to claim 8 wherein said flexible cord extends through at least one bone canal.
10. A method for implanting a device within a patient according to claim 8 wherein said flexible cord extends through at least one bone canal with a portion projecting from said patient.
11. A method for implanting a device within a patient comprising:
- (a) opening and debriding a target bone system;
- (b) forming a canal through said target bone system;
- (c) providing a k-wire from one end of which extends a flexible cord, and an implant comprising a body from opposite ends of which project at least one pair of beams arranged about a longitudinal axis of said body wherein said body defines a passageway along said longitudinal axis, said beams each being fixed to said body and each having a coupling latch with a bore;
- (d) releasably coupling said latch of each of said beams by inserting said k-wire into said latch bores thereby biasing said beams;
- (e) inserting said implant, said k-wire, and said flexible cord into said canal such that at least a portion of said flexible cord protrudes from said target bone system;
- (d) pulling upon said portion of said flexible cord protruding from said target bone system so as to decouple and remove said k-wire from said latches thereby decoupling and releasing said beams from their biased state so that a portion of each beam engages a surface of the surrounding bone that defines said canal.
12. A method for implanting a device within a patient according to claim 11, further comprising extending said flexible cord outside the body of said patient.
13. A method for implanting a device within a patient according to claim 11 further comprising extending said flexible cord through at least one bone canal with a portion projecting from said patient prior to step (d).
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Type: Grant
Filed: Aug 15, 2014
Date of Patent: Nov 22, 2016
Patent Publication Number: 20150223849
Assignee: Wright Medical Technology, Inc. (Memphis, TN)
Inventors: Daniel F. McCormick (Germantown, TN), Timothy M. O'Kane (Munford, TN)
Primary Examiner: Lynnsy Summit
Application Number: 14/460,808
International Classification: A61B 17/70 (20060101); A61B 17/72 (20060101); A61B 17/84 (20060101); A61B 17/86 (20060101); A61B 17/88 (20060101);